Probabilistic Seismic Hazard Analysis of Caisson-Type Breakwaters

J. Ocean Eng. Technol. 2005;19(1):26-32.

KIM SANG-HOON;KIM DOO-KIE;

Daewoo Engineering and Construction Co., Ltd,;Department of Civil and Environmental Engineering, Kunsan National University;

케이슨 방파제의 확률론적 지진재해도 평가

김상훈;김두기;

(주)대우건설 구조설계팀;군산대학교 토목환경공학부;

Keywords: Caisson-Type Breakwater, Probabilistic Theory, Deterministic Theory, Seismic Risk Analysis, Seismic Fragility, Seismic Hazard

핵심용어: 케이슨 방파제, 확률론, 결정론, 지진위험도 분석, 지진취약도, 지진재해도

Abstract

Recent earthquakes, measuring over a magnitude of 5.0, on the eastern coast of Korea, have aroused interest in earthquake analyses and the seismic design of caisson-type breakwaters. Most earthquake analysis methods, such as equivalent static analysis, response spectrum analysis, nonlinear analysis, and capacity analysis, are deterministic and have been used for seismic design and performance evaluation of coastal structures. However, deterministic methods are difficult for reflecting on one of the most important characteristics of earthquakes, i.e. the uncertainty of earthquakes. This paper presents results of probabilistic seismic hazard assessment(PSHA) of an actual caisson-type breakwater, considering uncertainties of earthquake occurrences and soil properties. First, the seismic vulnerability of a structure and the seismic hazard of the site are evaluated, using earthquake sets and a seismic hazard map; then, the seismic risk of the structure is assessed.